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윤종태,김광희,김병탁,Youn, Jong-Tae,Kim, Kwang-Heui,Kim, Byung-Tak 한국인쇄학회 2003 한국인쇄학회지 Vol.21 No.2
In gravure printing, all of the ink in the gravure cells does not leave the cell onto the substrate. The ink transfer from plate to paper in the gravure printing was simulated by computer. A few studies have dealt with cell withdrawal with simplified Newtonian flow models however, this work was performed with the non-Newtonian inks with different simulation software.
윤종태(Jong Tae Youn),한현우(Hyun Woo Han) 한국공학교육학회 2011 공학교육연구 Vol.14 No.3
Women in the predominantly male-oriented college of engineering which is afflicted by the high dropout rate and the low employment rate of coeds in their majoring fields because of the die-hard male dominant culture. In order to resolve the related problems, P University has been actively engaged in a movement called “Women into Engineering” (WIE) to raise the gender cognitive awareness and to train women engineers for highly qualified work force. As part of the movement, a subject called “Women in Engineering” that focuses on the gender cognitive perspective is effective to reduce the dropout rate and to land a job inside their fields by stimulating their interest in their specialty and masting soft/hard skills. The study was conducted a survey of the coeds who have completed the “Women in Engineering” course to evaluate the degree of satisfaction perceived, and a t-test through comparing the group of the coeds and a group of coeds who have not taken the course. The results showed statistically significant responses indicating that both groups of coeds would like to see WIE offer more basic engineering courses like “Women in Engineering”. This may lay the foundation to offer other major engineering courses for juniors and seniors that emphasize the gender cognitive approach.
스크린 인쇄에서 인쇄 속도와 잉크 점도에 따른 잉크 전이 시뮬레이션에 관한 연구
최송아,윤종태,목지수,구철회,Choi, Song-Ah,Youn, Jong-Tae,Mok, Jee-Soo,Koo, Chul-Whoi 한국인쇄학회 2011 한국인쇄학회지 Vol.29 No.1
As screen printing is changed by automation recently, could print more exactly. However, must suffer great many trial and error to have still gotten perfect result. By the way, at this step, fair time and money should be invested. Therefore, if search for optimum condition in early time visualizing screen printing process using simulator program before progress printing, is judged that may be correct and gets printing result efficiently. In this paper, searched optimum printing speed and ink viscosity using FLOW-3D program. Also, the result could confirm truth that is agreeing almost with experiment contents. Through this, is thought that may expect extension of screen printing wide application that vivify advantage of screen print if use simulation program.
A Study on the Void Free of Via Hole Filling by Vacuum Printing Method in PCB
목지수,김기환,윤종태,Mok, Jee-Soo,Kim, Ki-Hwan,Youn, Jong-Tae The Korean Graphic Arts Communication Society 2006 한국인쇄학회지 Vol.24 No.1
본 연구에서는 PCB에 진공인쇄 방식이 적용된 스크린 인쇄방법을 이용하여 Pattern 및 Hole충전의 신뢰성을 향상시킬 수 있는 기술을 적용하였다. 새로운 dry process 기술인 직접회로 인쇄 기술은 일반적으로 사용되고 있는 wet process 중 도금, 에칭, 박리 등의 공정을 줄일 수 있어 제조원가, 공정 리드타임 감소, 폐기물 감소로 환경 친화적 공정이라고 할 수 있다. 직접회로 인쇄는 진공도 100 Pa, 인쇄압력 0.45 MPa, 인쇄 속도 30 mm/sec, 인쇄각도 85도, 스크린 마스크와 기판 사이의 Gap 2 mm에서 인쇄될 때 가장 좋은 결과를 보였다. 직접회로 인쇄에 사용된 인쇄기는 일반 PCB공정에서 사용되는 동일한 형태에 진공조건을 유지시킬 수 있도록 개선하여 사용하였다.